"I ended up capturing the Britney Spears moment he was having. After the video had ended, re-watched it probably about 30 times and I was like okay, 'This sounds oddly familiar,'" he explained. "I looked at him and I was like, 'Riley, you just sang Britney Spears' ... and then he runs and jumps in my lap, so I guess he knew that he was serving vocals, that he was being a true legend in that moment."

Watch the video, as well as a side-by-side comparison with "Toxic," below.